in a Camper we usually have many different way to charge the battery (in my case LiFePO4):

  • Solar
  • Plug
  • Engine

It may happen that 2 or more are charging at the same time (for example the Engine and the Solar), the question is: how do they cooperate ? they are connected in paraller which lead to a possible conclusion that they behave as Constant source of current ..

Does anybody have any idea ?

I would like to create my own battery charger by converting the eat of the waste from the gasoline heather (with the support of peltier cells).

Thanks CC

  • 1
    \$\begingroup\$ We don't know which chargers you have and how they cooperate or don't cooperate. \$\endgroup\$
    – Justme
    Oct 21, 2021 at 20:08

1 Answer 1


If your camper is like mine, the charger controller deals with this. It chooses the most appropriate source that’s available and gives priority to it: shore power, then solar, then car battery (alternator).

Further, there’s usually protection to prevent discharging the car battery when the engine isn’t running: it will sense the car battery voltage and only enable sourcing power from it when it sees that the alternator is running (voltage higher than the battery resting charge.) This is a separate little box in my setup.

  • \$\begingroup\$ The point is that MPPT from VE are able to work in parallel.. this is why I was looking for a way to achieve the same... \$\endgroup\$
    – CIccio
    Nov 16, 2021 at 21:03
  • \$\begingroup\$ Without knowing the particulars of your controller it's hard to say. The safe assumption is that it uses only one source at a time rather than current-sharing between them. \$\endgroup\$ Nov 16, 2021 at 21:11

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